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Updates to comments on the VDBE opcodes.

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FossilOrigin-Name: 49c05b4e08920797f3a5dd14c292e2275db61acb
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drh
2010-08-30 01:17:20 +00:00
parent 635a606160
commit 710c4841b0
3 changed files with 28 additions and 25 deletions
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27
src/vdbe.c
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@@ -961,11 +961,7 @@ case OP_Null: { /* out2-prerelease */
/* Opcode: Blob P1 P2 * P4
**
** P4 points to a blob of data P1 bytes long. Store this
** blob in register P2. This instruction is not coded directly
** by the compiler. Instead, the compiler layer specifies
** an OP_HexBlob opcode, with the hex string representation of
** the blob as P4. This opcode is transformed to an OP_Blob
** the first time it is executed.
** blob in register P2.
*/
case OP_Blob: { /* out2-prerelease */
assert( pOp->p1 <= SQLITE_MAX_LENGTH );
@@ -1439,7 +1435,7 @@ case OP_Function: {
/* Opcode: ShiftLeft P1 P2 P3 * *
**
** Shift the integer value in register P2 to the left by the
** number of bits specified by the integer in regiser P1.
** number of bits specified by the integer in register P1.
** Store the result in register P3.
** If either input is NULL, the result is NULL.
*/
@@ -1601,7 +1597,7 @@ case OP_ToNumeric: { /* same as TK_TO_NUMERIC, in1 */
/* Opcode: ToInt P1 * * * *
**
** Force the value in register P1 be an integer. If
** Force the value in register P1 to be an integer. If
** The value is currently a real number, drop its fractional part.
** If the value is text or blob, try to convert it to an integer using the
** equivalent of atoi() and store 0 if no such conversion is possible.
@@ -1642,7 +1638,7 @@ case OP_ToReal: { /* same as TK_TO_REAL, in1 */
**
** If the SQLITE_JUMPIFNULL bit of P5 is set and either reg(P1) or
** reg(P3) is NULL then take the jump. If the SQLITE_JUMPIFNULL
** bit is clear then fall thru if either operand is NULL.
** bit is clear then fall through if either operand is NULL.
**
** The SQLITE_AFF_MASK portion of P5 must be an affinity character -
** SQLITE_AFF_TEXT, SQLITE_AFF_INTEGER, and so forth. An attempt is made
@@ -1801,8 +1797,8 @@ case OP_Permutation: {
/* Opcode: Compare P1 P2 P3 P4 *
**
** Compare to vectors of registers in reg(P1)..reg(P1+P3-1) (all this
** one "A") and in reg(P2)..reg(P2+P3-1) ("B"). Save the result of
** Compare two vectors of registers in reg(P1)..reg(P1+P3-1) (call this
** vector "A") and in reg(P2)..reg(P2+P3-1) ("B"). Save the result of
** the comparison for use by the next OP_Jump instruct.
**
** P4 is a KeyInfo structure that defines collating sequences and sort
@@ -2345,12 +2341,9 @@ case OP_Affinity: {
/* Opcode: MakeRecord P1 P2 P3 P4 *
**
** Convert P2 registers beginning with P1 into a single entry
** suitable for use as a data record in a database table or as a key
** in an index. The details of the format are irrelevant as long as
** the OP_Column opcode can decode the record later.
** Refer to source code comments for the details of the record
** format.
** Convert P2 registers beginning with P1 into the [record format]
** use as a data record in a database table or as a key
** in an index. The OP_Column opcode can decode the record later.
**
** P4 may be a string that is P2 characters long. The nth character of the
** string indicates the column affinity that should be used for the nth
@@ -3542,7 +3535,7 @@ case OP_IsUnique: { /* jump, in3 */
**
** Use the content of register P3 as a integer key. If a record
** with that key does not exist in table of P1, then jump to P2.
** If the record does exist, then fall thru. The cursor is left
** If the record does exist, then fall through. The cursor is left
** pointing to the record if it exists.
**
** The difference between this operation and NotFound is that this